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New Pool with Nutgrass growing through liner

Hi,
When we had the pool insalled last month the installer recommended spraying the area with nutgrass killer so we did. Even taking all that precaution, yesterday while swimming I noticed two places on the cove where nutgrass had grown through. I didn't pull them yet until I could ask the experts here how to handle this situation.
So should I go ahead and pull them out of the liner and put a patch over them? I'm afraid they well just grow back through the patch.
Or should I spray the area with more killer and let them die without pulling them?

Re: New Pool with Nutgrass growing through liner

Thanks for the replies, I didn't want to pull it out and leave the hole without a patch in hand. I think I will try as suggested and try to inject some herbicide through the rocks and under the liner to kill it before I pull it out, otherwise it will just grow back through.

Re: New Pool with Nutgrass growing through liner

You can use a pump sprayer. Be sure to get pre-emergent herbicide that is stated for nutsedge. Just take a rod and make a hole in the ground angled under the pool and stick the nozzle in it, and saturate the ground good. You'll need to do that many places around the pool. Then just patch the holes after the grass dies.